Microstructure evolution of ZA72 magnesium alloy during partial remelting
The application of some semi-solid forming magnesium alloys is restricted due to their weak mechanical properties. To improve the mechanical properties, it is necessary to research the regularity and theory of semi-solid microstructure evolution of the alloy. In this study, microstructure evolution...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Foundry Journal Agency
2013-03-01
|
| Series: | China Foundry |
| Subjects: | |
| Online Access: | http://www.foundryworld.com/uploadfile/2013040250966925.pdf |
| _version_ | 1818565598790025216 |
|---|---|
| author | Feng Kai Huang Xiaofeng Ma Ying |
| author_facet | Feng Kai Huang Xiaofeng Ma Ying |
| author_sort | Feng Kai |
| collection | DOAJ |
| description | The application of some semi-solid forming magnesium alloys is restricted due to their weak mechanical properties. To improve the mechanical properties, it is necessary to research the regularity and theory of semi-solid microstructure evolution of the alloy. In this study, microstructure evolution of ZA72 alloy during the partial remelting, and the effect of holding temperature and holding time on the semi-solid microstructure evolution of ZA72 magnesium alloy were investigated by means of OM, SEM and EDS analysis. The results indicate that the microstructure with small and spheroidal semi-solid particles which are available for thixo-forming can be obtained using proper heating parameters. After being isothermally treated at between 580 and 610 ℃ for 30 min, the equivalent size and shape factor of primary solid phase of ZA72 alloy decrease gradually, while the liquid volume fraction increases. When isothermally treated at 600 ℃ and held for different times from 15 to 60 min, with the increase of holding time, the equivalent size of primary particles decreases at first and then increases gradually; while the shape factor decreases gradually. The best heat treatment parameters in this experiment are to hold at 610 ℃ for 30 min. Compared with as-cast ZA72 alloy, the sizes of the eutectic phase and second α-Mg phase obtained in semi-solid state are smaller due to the higher solidification rate and the higher under-cooling degree than as-cast state. These decrease the fracture probability during tensile stress and improve the properties of the ZA72 alloy by semi-solid forming. |
| first_indexed | 2024-12-14T01:43:19Z |
| format | Article |
| id | doaj.art-89f0453c577c469ab11c16fc8ab638d9 |
| institution | Directory Open Access Journal |
| issn | 1672-6421 |
| language | English |
| last_indexed | 2024-12-14T01:43:19Z |
| publishDate | 2013-03-01 |
| publisher | Foundry Journal Agency |
| record_format | Article |
| series | China Foundry |
| spelling | doaj.art-89f0453c577c469ab11c16fc8ab638d92022-12-21T23:21:39ZengFoundry Journal AgencyChina Foundry1672-64212013-03-011027480Microstructure evolution of ZA72 magnesium alloy during partial remeltingFeng KaiHuang XiaofengMa YingThe application of some semi-solid forming magnesium alloys is restricted due to their weak mechanical properties. To improve the mechanical properties, it is necessary to research the regularity and theory of semi-solid microstructure evolution of the alloy. In this study, microstructure evolution of ZA72 alloy during the partial remelting, and the effect of holding temperature and holding time on the semi-solid microstructure evolution of ZA72 magnesium alloy were investigated by means of OM, SEM and EDS analysis. The results indicate that the microstructure with small and spheroidal semi-solid particles which are available for thixo-forming can be obtained using proper heating parameters. After being isothermally treated at between 580 and 610 ℃ for 30 min, the equivalent size and shape factor of primary solid phase of ZA72 alloy decrease gradually, while the liquid volume fraction increases. When isothermally treated at 600 ℃ and held for different times from 15 to 60 min, with the increase of holding time, the equivalent size of primary particles decreases at first and then increases gradually; while the shape factor decreases gradually. The best heat treatment parameters in this experiment are to hold at 610 ℃ for 30 min. Compared with as-cast ZA72 alloy, the sizes of the eutectic phase and second α-Mg phase obtained in semi-solid state are smaller due to the higher solidification rate and the higher under-cooling degree than as-cast state. These decrease the fracture probability during tensile stress and improve the properties of the ZA72 alloy by semi-solid forming.http://www.foundryworld.com/uploadfile/2013040250966925.pdfZA72 magnesium alloymicrostructure evolutionpartial remeltingsemi-solid |
| spellingShingle | Feng Kai Huang Xiaofeng Ma Ying Microstructure evolution of ZA72 magnesium alloy during partial remelting China Foundry ZA72 magnesium alloy microstructure evolution partial remelting semi-solid |
| title | Microstructure evolution of ZA72 magnesium alloy during partial remelting |
| title_full | Microstructure evolution of ZA72 magnesium alloy during partial remelting |
| title_fullStr | Microstructure evolution of ZA72 magnesium alloy during partial remelting |
| title_full_unstemmed | Microstructure evolution of ZA72 magnesium alloy during partial remelting |
| title_short | Microstructure evolution of ZA72 magnesium alloy during partial remelting |
| title_sort | microstructure evolution of za72 magnesium alloy during partial remelting |
| topic | ZA72 magnesium alloy microstructure evolution partial remelting semi-solid |
| url | http://www.foundryworld.com/uploadfile/2013040250966925.pdf |
| work_keys_str_mv | AT fengkai microstructureevolutionofza72magnesiumalloyduringpartialremelting AT huangxiaofeng microstructureevolutionofza72magnesiumalloyduringpartialremelting AT maying microstructureevolutionofza72magnesiumalloyduringpartialremelting |